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Consolidated Balance Sheets (Parentheticals) - $ / shares
shares in Thousands
Dec. 31, 2017
Dec. 31, 2016
Common Stock, Number of Shares, Par Value and Other Disclosures    
Common stock, par value
Common stock, shares authorized 75,000 75,000
Common stock, shares issued 38,771 38,317
Common stock, shares outstanding 38,771 38,317
Preferred Stock, Number of Shares, Par Value and Other Disclosures    
Preferred stock, par value
Preferred stock, shares authorized 10,000 10,000
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0